CN114713625B - Method for synchronous heavy/metalloid conversion and greenhouse gas emission reduction through targeted regulation and control of soil microorganisms and application - Google Patents
Method for synchronous heavy/metalloid conversion and greenhouse gas emission reduction through targeted regulation and control of soil microorganisms and application Download PDFInfo
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- CN114713625B CN114713625B CN202210401561.7A CN202210401561A CN114713625B CN 114713625 B CN114713625 B CN 114713625B CN 202210401561 A CN202210401561 A CN 202210401561A CN 114713625 B CN114713625 B CN 114713625B
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- methionine
- arsenic
- met
- organic acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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- B09C1/08—Reclamation of contaminated soil chemically
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
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- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
The invention discloses a method for synchronously carrying out heavy/metalloid conversion and greenhouse gas emission reduction by targeted regulation and control on soil microorganisms and an application thereof, belonging to the cross technical field of microorganism and heavy metal contaminated soil remediation. The invention discovers for the first time that methionine can be remarkably promoted to targetedly promote soil microorganisms to promote arsenic methylation by compounding methionine and organic acid salt, and simultaneously methane generation under the condition of existence of methionine is effectively reduced. The invention further loads the methionine/organic acid salt preparation in the modified biochar material with a porous structure, achieves the slow release effect and effectively solves the problem of rapid decomposition of methionine/in a soil system. In addition, the material is combined with cysteine, so that the effect of selectively methylating arsenic in the arsenic-mercury composite polluted soil is realized. The method can effectively reduce the absorption of inorganic arsenic by rice, realize the great reduction of the proportion of the inorganic arsenic in the total arsenic of the rice, and simultaneously inhibit the emission of soil methane and reduce the emission.
Description
Technical Field
The invention belongs to the technical field of cross restoration of microorganisms and polluted soil, and particularly relates to a method for synchronously performing heavy/metalloid conversion and greenhouse gas emission reduction by targeted regulation and control on soil microorganisms and an application thereof.
Background
The paddy soil has the important function of grain production and is a nonrenewable resource for supporting the survival of human beings in the world. However, due to the double influence of high intensity activities of human beings and high geological background superposition, the problem of heavy (class) metal pollution such as cadmium and arsenic in the rice field soil is prominent, the heavy (class) metal of rice exceeds the standard, and the human health is threatened. Meanwhile, the paddy field is a typical artificial wetland and is an important greenhouse gas (especially methane) emission source. The warming effect of methane is reported to be 25 times that of carbon dioxide. Therefore, the paddy soil effectively reduces the emission of greenhouse gases and has important contribution to realizing the aim of carbon neutralization in the earlier stage of realizing heavy (similar) metal pollution control and safe grain production. Therefore, exploring a technical strategy capable of systematically realizing the above-mentioned goals has important significance for guaranteeing the sustainable production of the world rice field and restraining climate change.
At present, the remediation of the heavy (like) metal polluted paddy soil is mainly based on two methods of removal and immobilization, so that the risk of the heavy (like) metal polluted paddy soil is reduced. The engineering measures mainly comprise a soil-bearing method, soil replacement and turning, surface soil removal and the like, and are based on the characteristic that heavy (similar) metal pollution of soil is generally concentrated on the surface layer of the soil. The method has the advantages of large implementation engineering amount, high investment cost, damage to the soil body structure, reduction of soil fertility, large energy consumption, unfavorable emission reduction of greenhouse gas and insufficient sustainability, and is only suitable for repairing the soil seriously polluted by small area. The fixation and stabilization technology mainly realizes the stabilization of cadmium and arsenic in soil by applying inorganic mineral materials, such as patent CN201710413193, and by using composite materials such as lime, humus and the like to improve the pH value, organic matter content and the like of the soil, while the invention patent CN201710243623.5 prepares the heavy (similar) metal contaminated soil of the biochar material by using straws and iron salts, and the application amount reaches 22.5-67.5t/hm 2 And the application amount is too large, so that the method cannot be used for large-area farmland control. The invention patent ZL201810816810.2 in the previous period utilizes peat soil and the like, combines iron powder, ferrous salt and the like to invent a cadmium-arsenic synchronous passivating agent with a three-layer structure, and realizes synchronous and efficient passivation of arsenic and cadmium. On the one hand, then, the above-mentioned techniques mainly consider only heavy (metal-like) metal stabilization performance and applications, without involving the effect of greenhouse gas emissions. The existing research shows that the peat is more beneficial to the emission of methane and is not beneficial to the emission reduction of greenhouse gases (Pedosphere 2009,19: 409-); on the other hand, aiming at the problem of arsenic pollution of soil, because organic arsenic is nontoxic, the limitation of arsenic in food standards is usually based on inorganic arsenic, and the technology mainly realizes the oxidation and adsorption fixation of arsenic through physical and chemical actions, so that the proportion of inorganic arsenic with higher rice poisoning property to total arsenic cannot be effectively reduced. Therefore, the total amount is reduced, and the proportion of inorganic arsenic is also reducedIs the key for reducing the health risk of the arsenic in the rice.
In summary, how to effectively reduce the activity of heavy (similar) metals in soil and finally achieve the rice heavy metal standard reaching, and the multi-target cooperative treatment of greenhouse gas emission reduction still remain important technical challenges currently facing.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provides a method for synchronously performing heavy/metalloid conversion and reducing emission of greenhouse gases by targeted regulation and control of soil microorganisms.
The invention also aims to provide a preparation for targeted regulation and control of soil microorganisms and synchronous heavy/metalloid conversion and greenhouse gas emission reduction.
The invention further aims to provide a preparation method of the preparation for targeted regulation and control of soil microorganism synchronous heavy/metalloid conversion and greenhouse gas emission reduction.
The purpose of the invention is realized by the following technical scheme:
a method for synchronously carrying out heavy/metalloid conversion and greenhouse gas emission reduction by targeted regulation and control of soil microorganisms is characterized in that a preparation containing methionine (Met) and organic acid salt (Fat) is simultaneously placed in arsenite and/or arsenate polluted soil, and arsenic methylation and methane emission reduction are synchronously realized.
Further, the organic acid salt is at least one of acetate (Ace), lactate (Lac) or butyrate (But) of sodium, potassium, calcium and the like. All the sodium salts used in the examples of the present invention.
Further, the mol ratio of the methionine to the organic acid salt is 1: 5-1: 50; preferably 1: 10.
Furthermore, the addition amount of the methionine is calculated according to the concentration of the methionine in a system being 0.5-1.5 mM; preferably 1 mM.
Further, the methylation is at least one of monomethylation, dimethylation and trimethylation.
Further, the soil is paddy field soil.
A preparation for synchronously carrying out heavy/metalloid conversion and greenhouse gas emission reduction on soil microorganisms in a targeted regulation manner is the preparation containing methionine and organic acid salt in the method.
The preparation method of the preparation for synchronously carrying out heavy/metalloid conversion and greenhouse gas emission reduction on the soil microorganism in the targeted regulation and control manner comprises the following steps:
the method I comprises the following steps: directly mixing methionine and organic acid salt;
and a method II: methionine and organic acid salt are loaded into the porous biochar material.
Further, the porous biochar material has an ultra-large specific surface area and is prepared by the following method:
step 1: crushing a biomass raw material, preferably balsawood, into particles with the particle size of less than 2mm, cleaning and drying;
step 2: placing the particles prepared in the step (1) in a vacuum tube furnace, heating to 500-1100 ℃ under the protection of nitrogen or inert gas, preferably 800 ℃, and keeping for 1-3 hours to prepare a porous biochar material (BC) before treatment;
and step 3: and (3) soaking the porous biochar material before treatment prepared in the step (2) in a Tri-HCl buffer solution containing dopamine or in a Tri-HCl buffer solution containing dopamine and cysteine for reaction to obtain the porous biochar material (BC-PDP, BC-PDP-S). The purpose of the cysteine is to form a thiol functional group during the formation of Polymeric Dopamine (PDP) on the BC surface layer by the cysteine.
Further, the specific steps of cleaning and drying in step 1 are as follows: the resulting granules were soaked in 2.5M NaOH, 0.4M Na 2 SO 3 、2.5M H 2 O 2 The mixed solution of (1) was stirred uniformly, transferred to a reaction vessel, and kept at 100 ℃ for 10 hours.
Further, the concentration of the Tri-HCl buffer solution described in step 3 was 10mM, and the pH was 7.5 ± 0.2.
Further, the concentration of the dopamine and the cysteine in the system in the step 3 is 0.5-1.5 mM; preferably 1 mM.
Further, the reaction condition in the step 3 is stirring reaction for 50-70 min; preferably, the reaction is stirred for 60 min.
Further, the method I comprises the following specific steps: methionine and organic acid salt are mixed in a mixed solution of sodium hydrogen phosphate, magnesium chloride, calcium chloride and ammonium chloride according to a certain proportion.
Further, the method II comprises the following specific steps: and directly adding methionine and organic acid salt for stirring after obtaining the porous biochar material, fully adsorbing the methionine and the organic acid salt with the porous biochar material to form a composite system, and airing to obtain the preparation for targeted regulation and control of synchronous heavy/metalloid conversion of soil microorganisms and greenhouse gas emission reduction.
Further, the concentration of the methionine and the organic acid salt in the reaction system is 1: 5-1: 50 according to the molar ratio of the methionine and the organic acid salt in the formed composite system; preferably 1: 10.
In the preparation for synchronously carrying out heavy/metalloid conversion and greenhouse gas emission reduction on soil microorganism in targeted regulation and control obtained in the preferred embodiment of the invention, the mass of Met and Fat in Met/Fat @ BC-PDP accounts for 20.5% of the total mass, and the mass of Met and Fat in Met/Fat @ BC-PDP-S accounts for 19.8% of the total mass.
The preparation and the clostridium bacteria are simultaneously placed in arsenite and/or arsenate polluted soil to synchronously realize arsenic methylation and methane emission reduction.
Further, the Clostridium bacterium is Clostridium sporogenes (Clostridium sporogenes); preferably Clostridium sporogenes LHA 6. The strain is preserved in the Guangdong province microbial strain preservation center (GDMCC) of No. 59 large yard of Zhan-July 100, Zhaoxiu, Guangzhou city, Guangdong province in 2022, 1 month and 14 days, and the preservation numbers are: GDMCC No: 62212. the clostridium sporogenes has the function of fermenting, producing hydrogen and synchronously performing anaerobic arsenic methylation.
Further, the addition amount of the Clostridium bacteria is determined according to the cell density OD of the bacteria in the reaction system 600 Calculated as 0.1.
A composite preparation for targeted regulation and control of soil microorganism synchronous heavy/metalloid conversion and greenhouse gas emission reduction comprises the preparation and the Clostridium bacteria.
Compared with the prior art, the invention has the following advantages and effects:
met is an effective methyl donor, can effectively promote methylation reactions including DNA, arsenic, mercury, protein and the like, but lacks effective targeting and selectivity, and is rapidly decomposed in the environment and insufficient in long-acting property. According to the invention, after Met and specific organic acid salt (specifically acetate, lactate and butyrate) are compounded according to a specific proportion, the targeting promotion of Met on soil microorganisms can be obviously promoted to promote arsenic methylation, and meanwhile, the methane generation under the condition of Met is effectively reduced; in particular, when the combination is Met + Ace, Met + Lac can make the emission of methane lower than that of a control group (namely, an arsenic-polluted soil system without Met), and the emission of soil methane is remarkably reduced and inhibited.
On the basis, the invention further constructs a Met/Fat @ BC-PDP-S and a Met/Fat @ BC-PDP-S composite material, successfully loads the Met/Fat preparation into the modified biochar material with a porous structure, achieves the slow release effect, and effectively solves the problem of rapid decomposition of Met in a soil system; the dopamine modified porous biochar material is utilized, so that the affinity of Met/Fat on the surface of the biochar is remarkably improved, and the load capacity of the biochar is greatly improved. In addition, the two modified biochar materials can further reduce the emission of soil methane; aiming at the mercury and arsenic polluted soil, the biochar material modified by cysteine composite PDP effectively inhibits the occurrence of mercury methylation, better regulates and controls arsenic methylation in a targeted manner, reduces the proportion of inorganic arsenic and inhibits the occurrence of methyl mercury.
In general, the preparation and the composite material thereof can effectively reduce the absorption of inorganic arsenic by rice, realize the great reduction of the proportion of the inorganic arsenic in the total arsenic of the rice, and simultaneously inhibit the emission of soil methane and reduce the emission.
Drawings
FIG. 1 is a statistical plot of methyl arsenic content and methane emission in soils treated with different combinations of Fat and Met;
FIG. 2 is a statistical graph of methyl arsenic content and methane emission in different proportions of Met/Fat treated soil;
FIG. 3 is a graph showing the relationship between the abundance of Clostridium bacteria containing the arsM gene and the abundance of segmentobacter bacteria whose sediments do not carry the arsM gene and the arsenic methylation rate in the soil treated by different Fat and Met combinations;
FIG. 4 is a statistical graph of methyl arsenic content and methane emission in soil treated by the combination of Met/Fat and LHA6 strains;
FIG. 5 is a graphical representation of the binding and functional group characterization of Met/Ace @ BC-PDP to Met/Ace @ BC-PDP-S composites; wherein, (a) is Met/Ace @ BC-PDP, (b) is Met/Ace @ BC-PDP-S, and (c) is infrared spectrogram;
FIG. 6 is a graph showing the effect of slow release of Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S in soil solution;
FIG. 7 is a statistical plot of methyl arsenic content and methyl mercury content in Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S treated soils;
FIG. 8 is a graph showing the evaluation of the efficiency of Met/Fat @ BC-PDP in combination with LHA6 strain in regulating soil arsenic methylation and reducing rice arsenic; wherein A is the weight of the rice, B is the total arsenic content of the rice, C is the inorganic arsenic proportion of the rice, and D is the methyl arsenic content of the soil.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1: comparison of the Effect of different Fat and Met combinations in regulating and controlling methane emission and arsenic methylation in soil
5 g of arsenic-contaminated paddy soil collected from a place in Hunan was taken in a 20mL glass sample tube, 2.5mL of sterilized culture medium was added, and the mixture was placed in an anaerobic glove box for culture. The culture solution is composed of 10mM NH 4 Cl，5mM NaHCO 3 ，1mM KH 2 PO 4 ，0.5mM MgCl 2 ，0.5CaCl 2 ，1mL L -1 Vitamins and 1mL/L trace elements; after 15 days of anaerobic culture in a glove box, adding different Fat and Met combinations (namely Met treatment, Fat treatment and Met + Fat treatment) respectively, wherein Fat comprises formate, acetate, lactate, propionate and butyrate, the molar ratio of Met to Fat is 1:10, the concentration of Met is 1mM, and further reacting for 60 days after adding Met and FatThen, collecting headspace gas, measuring by using GC-TCD, extracting soil suspension, adding ammonium dihydrogen phosphate to desorb adsorbed methyl arsenic, passing through a 0.22 micron membrane, and measuring methyl arsenic in the soil solution by using HPLC-ICPMS, wherein the methyl arsenic comprises methyl arsenic, dimethyl arsenic and trimethyl arsenic oxide. A system which was subjected to anaerobic culture in a glove box for 15 days, without any treatment, and left to stand for 60 days was used as a control group.
As can be seen from FIG. 1, for the formation of methyl arsenic, the single Fat-treated group or Met-treated group was mainly maintained at a level of 0.04-0.1. mu.M, which was not significantly different from the control group (0.06. mu.M), while the Fat-and Met-treated group had a greatly improved yield of organic arsenic, which was 4.0-7.6. mu.M except the combination of propionate and methionine (0.7. mu.M), which was 57-152 times higher than that of the single-treated group, and the methylation rate of total arsenic was more than 16%. The above results show that the combination of Fat + Met significantly enhanced the production of methyl arsenic, whereas the conversion of methyl arsenic was highest with the combination of acetate or lactate and methionine, whereas the enhancement of organic arsenic production by the combination of formate and methionine was insignificant. On the other hand, aiming at the generation of methane, the single Fat or Met treatment group remarkably causes the emission of methane in soil, and the emission is remarkably increased to 18-25.7 mM and is improved by 3.3-4.7 times compared with the 5.5mM of a control group; and in the Fat + Met combined treatment group, the methane emission of three treatment groups of butyrate, lactate, acetate and methionine is respectively 3.5mM, 2.2mM and 1.9mM which are significantly lower than that of a control group of 5.5mM, which indicates that the three treatment groups can realize the reduction of methane in soil and synchronously realize the promotion of the methylation of soil arsenic, wherein the combination effect of acetate and methionine is optimal. The combination of formate, propionate and methionine results in a substantial increase in methane emission, and synergy between methane emission reduction and arsenic methylation cannot be achieved.
On the basis of the experimental results, the effects of treatment of butyrate, lactate, acetate and methionine on soil polluted by a plurality of arsenic in Chenzhou, Guangxi river pond, Guangdong Shaoguan and the like in Hunan province are further evaluated, and the results show that the synergy of arsenic methylation and methane emission reduction is realized.
Example 2: comparison of effects of different proportions of Met/Fat in regulating and controlling methane emission and arsenic methylation in soil
On the basis of example 1, the effect of the combination of acetate and methionine on methane emission and arsenic methylation at different molar ratios was evaluated separately. Experimental protocol referring mainly to example 1, after 15 days of anaerobic culture of soil suspensions, methionine and butyrate or acetate were added in the following molar ratios: 0. six treatments of 1:50, 1:25, 1:10, 1:5, 1:1, etc., wherein the methionine concentration is 1 mM; on the basis, after further anaerobic culture for 60 days, headspace gas is collected, the GC-TCD determination is utilized to extract soil suspension, ammonium dihydrogen phosphate is added to desorb adsorbed methyl arsenic, and after the methyl arsenic passes through a 0.22 micron membrane, the HPLC-ICPMS is utilized to determine the methyl arsenic in the soil solution.
As can be seen from FIG. 2, as the molar ratio of acetate to methionine salt was increased from 0 to 1:10, methyl arsenic production in the soil suspension was gradually increased from 0.1. mu.M to 7.6. mu.M, which was increased by 76 times, and further as the molar ratio of acetate was increased, methyl arsenic production was substantially maintained at a level of 7.2 to 7.7. mu.M; in contrast, for methane production, as the ratio of acetate increased, methane production gradually decreased from 18.7mM in the single methionine treatment group to 1.9mM under 1:10 conditions, and further increased the ratio of acetate to 1:2, the methane production increased rapidly to 18.3 mM. In contrast, formate and methionine have similar trends at different molar ratios, but although the combination can promote arsenic methylation to some extent, the system generates methane far larger than the control group as shown in example 1 no matter in the set ratio range, and cannot realize the synergy of methane emission reduction and arsenic methylation promotion. It can be seen that the ratio of organic acid salt to methionine and the combination of classes both have important effects on the synergy of methane abatement and arsenic methylation promotion.
Example 3: analysis and evaluation of gene expression and biomass of Met/Fat-regulated soil functional microorganisms
RNeasy PowerSoil Tota was used for the soil samples treated differently in example 1 and example 2 aboveThe RNA Kit extracts total RNA of soil, removes genome DNA, and reversely transcribes the RNA to synthesize double-stranded cDNA. Performing functional gene PCR library construction by using cDNA, and then performing amplicon sequencing to obtain a functional gene community structure and related microorganism abundance; the absolute quantification of the arsM and mcrA genes in the cDNA was performed using a fluorescent quantitative PCR instrument (CFX 384Real-Time PCR Detection System). The primer used for amplifying the arsM gene is arsMF1/arsMR2, and the length of the fragment is about 350 bp; the mcrA gene amplification primer is mlas/mcrA-rev, and the fragment length is about 450 bp. The qPCR amplification system is 20 μ L, and comprises 10 μ L of TB Green Premix Ex Taq Premix, 0.2 μ M upstream and downstream primers, 10ng of cDNA template and RNA-free water. Construction of plasmid Standard product by linking vector pUC19 with arsM or mcrA gene PCR product, picking out single clone, extracting plasmid DNA, measuring DNA concentration with Qubit 3.0Fluorometer, calculating gene copy number, and diluting with EASY dilution diluent to 10 2 -10 8 Standard curve (in copy number per μ L). Three repetitions are set for all samples and negative controls for fluorescence quantification, the amplification efficiency is 90% -100%, and the correlation coefficient of a standard curve is>0.9. The primer information and reaction program for amplification of the arsM and mcrA genes were as follows:
arsMF1：5'-TCYCTCGGCTGCGGCAAYCCVAC-3'(SEQ ID NO.1)
arsMR2：5'-CGWCCGCCWGGCTTWAGYACCCG-3'(SEQ ID NO.2)
mlas：5'-GGTGGTGTMGGDTTCACMCARTA-3'(SEQ ID NO.3)
mcrA-rev：5'-CGTTCATBGCGTAGTTVGGRTAGT-3'(SEQ ID NO.4)
arm m amplification reaction procedure: 10min at 95 ℃; 30s at 95 ℃, 45s at 60 ℃ and 1min at 72 ℃ for 40 cycles; extending for 10min at 72 ℃;
mcrA amplification reaction program: 10min at 95 ℃; at 95 ℃ for 15s, at 58 ℃ for 30s and at 72 ℃ for 30s, and 40 cycles; extension at 72 ℃ for 2 min.
The results showed that the number of transcription copies of the arsenic methylation gene arsM and the methanogenic gene mcrA in the soil control group were 950 and 1.5 x 10, respectively 6 Copy number/g of soil, while in the single methionine treated group, the transcriptional copy numbers of arsM and mcrA were 1200 and 2.0 x 10, respectively 7 The copy number/g soil is obviously improved compared with a control group; and acetic acidSalt and methionine (molar ratio: 1:10) mixed treatment group, arcM and mcrA transcript copy numbers of 1.8 x 10, respectively 4 And 1.4 x 10 4 The copy number/g soil is respectively improved by 18.9 and reduced by two orders of magnitude compared with a soil control group, and the result proves that the treatment can realize the synchronization of the transcription up-regulation of the arsenic methylation gene of the soil microbial community and the transcription down-regulation of methanogenesis. As shown in figure 3, the combination of different organic acids and methionine can realize the up-regulation of the abundance of Clostridium Clostridium carrying the arsM gene in soil, thereby promoting arsenic methylation, and simultaneously, the down-regulation of Sedimibacter carrying no arsM gene can be realized, thereby effectively reducing or even cutting off the energy acquisition path and efficiency of soil methanogens interworked with the pseudomonas, and further effectively inhibiting the activity of the soil methanogens and the generation and emission of methane. Particularly, the combination of acetate and methionine can obviously improve the expression of the arsM gene carrying the arsenic methylation functional gene, and maximally reduce the expression of the methanogen mcrA gene.
Example 4: evaluation of composite regulation of arsenic methylation and methane emission reduction in soil by Met/Fat and Clostridium sporogenes LHA6
Further combined with Met/Fat based on previous our screening of Clostridium sporogenes (Clostridium sporogenes) LHA6 carrying the arsM genes. The strain has been preserved in Guangdong province microbial culture collection center (GDMCC) of No. 59 building of Mieli 100 college of the overseas Zhonglu 100 of the overseas city of Guangdong province in 14 days 1 month 2022, and the preservation numbers are: GDMCC No: 62212. referring to the experimental scheme of example 1, after anaerobic culture of a soil suspension for 15 days, arsenous acid is added exogenously to make the total arsenous acid (As (III)) content in the soil suspension reach 0.2mM, methionine and acetate are added in a molar ratio of 1:10, wherein the concentration of methionine is 1 mM; on the basis of the above treatment, a certain amount of the obtained bacterial liquid of LHA6 strain is added to make OD600 in the reaction system equal to 0.1, then anaerobic culture is further carried out for 60 days, headspace gas is collected, GC-TCD measurement is carried out, soil suspension is extracted, ammonium dihydrogen phosphate is added to desorb adsorbed methyl arsenic, and after 0.22 micron membrane is passed, HPLC-ICPMS is used to measure methyl arsenic in the soil solution.
As shown in FIG. 4, the productivity of methyl arsenic in soil of the treatment group of LHA6 strain and Met/Ace reached 180.5. mu.M, which is much higher than 122.5. mu.M of the treatment group of LHA6 strain and Met, and 60.3. mu.M of single LHA6 treatment; compared with the Met/Ace and single LHA6 treatment groups, the further combination of the Met/Ace and the LHA6 strain is improved by 22.8 times and 2 times respectively, and the combination of the Met/Ace and the LHA6 can obviously promote the methylation of arsenic in soil. On the other hand, the single LHA6 treatment synchronously increased the methane emission to 16.4mM, while the combination of LHA6 and Met further increased the methane emission to 15.3mM, while the combination of Met/Ace and LHA6 significantly inhibited the methane to 2.8mM, which was only about 50% of 5.5mM of the soil control group. The results show that the combination of LHA6 and Met/Ace significantly promotes the arsenic methylation efficiency of soil, and simultaneously the methane emission is well inhibited.
Example 5: preparation and characterization of Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S composite material
Step 1: crushing balsamiferous wood to obtain particles with particle size less than 2mm, and further soaking in 50mL of 2.5M NaOH and 0.4M Na 2 SO 3 ，2.5M H 2 O 2 Stirring the mixed solution evenly, transferring the mixed solution to a reaction kettle, and keeping the mixed solution at 100 ℃ for 10 hours;
step 2: placing the pretreated biomass powder particles in a vacuum tube furnace, heating to 800 ℃ under the protection of nitrogen, and carrying out pyrolysis for 1h to obtain a porous biochar material BC;
and step 3: soaking the obtained porous biochar material BC in 50mL of Tri-HCl buffer solution (the concentration of Tris-HCl is 10mmol/L and the pH value is 7.5) containing 1mM dopamine, and stirring for reacting for 1 hour to obtain a modified biochar material BC-PDP; taking the combination of acetate and methionine as an example, directly adding 5M of total molar concentration and Met/Ace with a molar ratio of about 1:10, further stirring for 1h, centrifuging to remove water, and airing at normal temperature to obtain the Met/Ace @ BC-PDP composite material.
The final concentration of Met/Ace molar ratio obtained was determined on HPLC and IC after extraction and further adjusted in the initial addition ratio to finally obtain a Met/Ace molar ratio of 1: 10.
Preparing a porous biochar material BC by referring to the step 1-2, soaking the porous biochar material BC in 50mL of Tri-HCl buffer solution (the concentration of Tris-HCl is 10mmol/L and the pH value is 7.5) containing 1mM dopamine and 1mM cysteine, and stirring for reacting for 1h to obtain a modified biochar material BC-PDP-S; taking the combination of acetate and methionine as an example, directly adding Met/Ace with a total molar concentration of 5M and a molar ratio of about 1:10, continuously stirring for reaction for 1h, centrifuging to remove water, and airing at normal temperature to obtain the Met/Ace @ BC-PDP-S composite material.
The final concentration of Met/Ace molar ratio obtained was determined on HPLC and IC after extraction and further adjusted in the initial addition ratio to finally obtain a Met/Ace molar ratio of 1: 10.
The quantitative analysis results of the Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S materials are as follows: the Met content of Met/Ace @ BC-PDP is 0.40mmol/g, the Ace content of the Met/Ace @ BC-PDP is 3.10mmol/g, the Met: Ace is 0.13, the Met content of Met/Ace @ BC-PDP-S is 0.32mmol/g, the Ace content of the Met/Ace @ BC-PDP-S is 2.80mmol/g, and the Met: Ace is 0.11.
As shown in FIG. 5, both the Met/Ace @ BC-PDP (FIG. 5 (a)) and the Met/Ace @ BC-PDP-S (FIG. 5 (b)) materials have good porous structures; further analysis in combination with infrared spectroscopy (FIG. 5 (c)) showed that the material at Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S was at 1587cm -1 、886cm -1 With significant in-plane bending vibration beta N-H And gamma N-H The peak is mainly from the vibration of methionine or polymerized dopamine, and in addition, the Met/Ace @ BC-PDP-S material is 1187cm -1 Has a clear v c-s The oscillation, probably mainly the oscillation peak from cysteine.
Example 6: Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S in soil solution for slowly releasing Met effect
On the basis of the experimental scheme of example 1, the Met/Ace @ BC-DP and the Met/Ace @ BC-PDP-S prepared in example 4 are utilized in a soil anaerobic culture system, after the soil suspension is subjected to anaerobic culture in a glove box for 15 days, the materials of the Met/Ace @ BC-DP and the Met/Ace @ BC-PDP-S are respectively added, and the adding amount of the materials is calculated according to the concentration of methionine in the system as 1 mM; further anaerobic culturing for 60 days; collecting soil suspension at different time points, adding methanol and the like to desorb methionine in the soil and materials, performing ultrasonic enhancement, passing through a 0.22 micron membrane, and measuring the content of methionine in the solution by using HPLC.
As can be seen from FIG. 6, the Met rapidly decreased with the reaction time and fell below the detection line after about 30 days for the single Met/Ace mixture treatment; while the release kinetics of Met in the Met/Ace @ BC-DP and Met/Ace @ BC-DP-S materials are significantly prolonged, the Met content in the Met/Ace @ BC-DP and Met/Ace @ BC-DP-S treated systems still reaches as high as 0.4mM and 0.51mM, respectively, at the same 30-day culture time point. After reacting for 60 days, in the two treatment groups, 0.1 mM and 0.18mM of Met still remain, the existence time of Met in a soil system is obviously prolonged, and a good slow release effect is shown.
Example 7: efficiency assessment of Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S regulation and control of soil arsenic methylation and methane emission reduction
Based on the material prepared in example 4, referring to the experimental scheme of example 1, certain arsenic-mercury composite contaminated soil from Guizhou is taken, after the soil suspension is subjected to anaerobic culture in a glove box for 15 days, Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S materials are respectively added, wherein the addition amount of the materials is calculated according to the concentration of methionine in the system as 1 mM; and after further anaerobic culture for 60 days, collecting headspace gas, measuring by using GC-TCD, extracting a soil suspension, adding ammonium dihydrogen phosphate to desorb adsorbed methyl arsenic, passing through a 0.22 micron membrane, measuring the methyl arsenic in the soil solution by using HPLC-ICPMS, and analyzing methyl mercury mainly based on gas chromatography cold vapor atomic fluorescence (GC-CVAFS).
As can be seen from FIG. 7, the soil methyl arsenic in the Met/Ace @ BC-PDP and Met/Ace @ BC-PDP-S material treatment groups respectively reaches 10.2 mu M and 11.5 mu M, which are significantly higher than the single Met/Ace treatment with the same equivalent and are also much higher than 0.04 mu M of the soil control group, and the results fully show that the prepared Met/Ace slow-release material effectively improves the regulation and control effect of Met/Ace on the microorganisms in the soil and plays a good role in promoting the generation of methyl arsenic; on the other hand, the two sustained-release material treatment groups also suppressed methane production well at 1.5mM and 1.8mM, respectively, and the inhibitory effect was slightly better than that of 2.1mM of simple Met/Ace. More importantly, except for the Met/Ace @ BC-PDP-S treatment group, the other two treatments obviously improve the formation of methyl mercury of the coexisting pollutant mercury in the soil, and the methyl mercury reaches 0.92 mu mol/kg and 0.85 mu mol/kg respectively, which are far higher than 0.08 mu mol/kg of the soil control group. Unlike methyl arsenic, the production of methyl mercury can lead to an exponential increase in the toxicity of mercury, thereby posing a risk. In the Met/Ace @ BC-PDP-S treatment group, the generation and the emission of methane are well inhibited and the generation of methyl arsenic is promoted, and the generation of methyl mercury is well inhibited at the level (0.09 mu mol/kg) of a control group, so that the generation of methyl mercury is well inhibited after cysteine modification, and the Met/Ace @ BC-PDP-S treatment group has good selectivity on the generation of methyl arsenic.
Example 8: evaluation of efficiency of Met/Fat @ BC-PDP composite LHA6 in regulation and control of soil arsenic methylation and reduction of rice arsenic based on potting experiment
The paddy field soil is collected from a paddy field polluted by Hunan Tan As in Hunan province, fallen leaves, animal residues and other impurities on the surface layer of the soil are removed during sampling, and the soil with the depth of 0-20 cm on the surface layer is collected. The soil is taken back to the laboratory for air drying, and animal and plant residues in the soil are further removed and sieved by a 2mm sieve. The physicochemical properties of the soil to be tested are respectively as follows: pH 5.8; total organic carbon of soil: 18.57 g/kg; total arsenic: 40.3 mg/kg. The potting experiment set up 4 treatments: control (CK), Met/Fat @ BC-DP powder with a mass ratio of 0.5%, LHA6 bacteria alone (100 mL of bacterial liquid with a dose OD600 of 0.5) and a combination of the two. The amount of soil per pot was about 3 kg. Before the beginning of a pot experiment, rice seeds are sterilized in 6 percent NaClO solution for 30min, washed by deionized water and then placed in a constant-temperature culture room for seedling culture, the seedling culture time is about three weeks, and the experimental rice variety is Huanghuazhan (Yue trial rice 2005010); adding fertilizer into each barrel 1d before seedling transplantation, wherein the addition amount is K 2 HPO 4 ·3H 2 O：0.344g/kg；KH 2 PO 4 ：0.038g/kg；CO(NH2) 2 : 0.21 g/kg. And after the rice seedling raising is finished, transplanting the rice seedlings to an experimental pot for flooding culture. After the rice is matured in the experimental pot in a greenhouse for 100 days, collecting the rice, placing the rice in a blast drying box for fully drying, and then weighing the dry weight of the overground part of the plant for analyzing the heavy metal in the plant sample; collecting soil, and adding phosphoric acidThe ammonium dihydrogen phosphate desorbs the adsorbed methyl arsenic, and passes through a 0.22 micron membrane. And measuring the form of the arsenic in the extracted heavy metal by HPLC-ICPMS.
As can be seen from FIG. 8, both the Met/Ace @ BC-DP treatment and the LHA6 treatment groups were effective in reducing the total arsenic content of rice from 1.5mg/kg to 0.5mg/kg and 0.72mg/kg, respectively, while the combination of Met/Ace @ BC-DP + LHA6 further reduced the total arsenic content of rice to 0.45 mg/kg; more importantly, the combined treatment dramatically reduced the inorganic arsenic content of rice to 15.7%, 74.5% relative to the control, 21.4% relative to the single Met/Ace @ BC-DP treatment, and 55.7% relative to the LHA6 treatment. Inorganic arsenic is more toxic and is the only arsenic morphological component to manage. Therefore, the combination of Met/Ace @ BC-DP + LHA6 can synchronously realize the characteristic of reducing the proportion of total arsenic and inorganic arsenic of rice; similarly, in different treatment groups, the combination of Met/Ace @ BC-DP + LHA6 can greatly improve the proportion of methyl arsenic in soil to 189.5 mu M, and the improvement amplitude is more than 18 times compared with 10.5 of a soil control group. Meanwhile, the combined treatment of Met/Ace @ BC-DP + LHA6 can effectively promote the rice yield increase, and the rice yield is increased to 11.2 g/plant from 8.9 g/plant of a control group. In general, the application potential of the technology in the aspects of repairing soil arsenic pollution, reducing rice arsenic risk and the like is further verified through a pot experiment.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
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Claims (9)
1. A method for synchronously arsenic-converting soil microorganism targeted regulation and controlling and greenhouse gas emission reduction is characterized by comprising the following steps: simultaneously placing a preparation containing methionine and organic acid salt in arsenite and/or arsenate polluted soil to synchronously realize arsenic methylation and methane emission reduction;
the organic acid salt is at least one of acetate, lactate or butyrate of sodium, potassium and calcium;
the mol ratio of the methionine to the organic acid salt is 1: 5-1: 50;
the addition amount of the methionine is calculated according to the concentration of the methionine in a reaction system being 0.5-1.5 mM.
2. The method for targeted regulation of soil microorganism synchronous arsenic conversion and greenhouse gas emission reduction as claimed in claim 1, wherein:
the mol ratio of the methionine to the organic acid salt is 1: 10;
the addition amount of the methionine is calculated according to the concentration of the methionine in the reaction system as 1 mM;
the methylation is at least one of monomethylation, dimethylation and trimethylation;
the soil is paddy field soil.
3. A preparation for targeted regulation and control of synchronous arsenic conversion of soil microorganisms and emission reduction of greenhouse gases is characterized by comprising the following components in parts by weight: the preparation is the preparation containing methionine and organic acid salt as described in any one of claims 1-2.
4. The method for preparing the preparation for targeted regulation and control of synchronous arsenic conversion and greenhouse gas emission reduction of soil microorganisms as claimed in claim 3, wherein the preparation comprises the following steps: the following method I or method II:
the method I comprises the following steps: directly mixing methionine and organic acid salt;
and a method II: methionine and organic acid salt are loaded into the porous biochar material.
5. The method of claim 4, wherein:
the porous biochar material is prepared by the following method:
step 1: crushing the biomass raw material into particles with the particle size of less than 2mm, cleaning and drying;
step 2: placing the particles prepared in the step (1) in a vacuum tube furnace, heating to 500-1100 ℃ under the protection of nitrogen or inert gas, and keeping for 1-3 hours to prepare a porous biochar material before treatment;
and step 3: soaking the porous biochar material before treatment prepared in the step 2 in a Tri-HCl buffer solution containing dopamine or in a Tri-HCl buffer solution containing dopamine and cysteine for reaction to obtain the porous biochar material;
the specific steps of cleaning and drying in the step 1 are as follows: the resulting granules were soaked in 2.5M NaOH, 0.4M Na 2 SO 3 、2.5M H 2 O 2 The mixed solution is evenly stirred and transferred to a reaction kettle, and the mixed solution is kept for 10 hours at the temperature of 100 ℃;
the concentration of the Tri-HCl buffer solution in the step 3 is 10mM, and the pH =7.5 +/-0.2;
the concentration of the dopamine and the cysteine in the reaction system in the step 3 is 0.5-1.5 mM;
the reaction condition in the step 3 is stirring reaction for 50-70 min.
6. The production method according to claim 4 or 5, characterized in that:
the method I comprises the following specific steps: mixing methionine and organic acid salt in a mixed solution of sodium bicarbonate, potassium dihydrogen phosphate, magnesium chloride, calcium chloride and ammonium chloride;
the method II comprises the following specific steps: after obtaining the porous biochar material, directly adding methionine and organic acid salt for stirring, fully adsorbing the methionine and the organic acid salt with the porous biochar material to form a composite system, and airing to obtain the targeted soil microorganism regulation and control synchronous arsenic conversion and greenhouse gas emission reduction preparation; the concentration of the methionine and the organic acid salt in the reaction system is calculated according to the molar ratio of the methionine to the organic acid salt in the formed composite system being 1: 5-1: 50.
7. The use of the agent for targeted regulation of simultaneous arsenic conversion and greenhouse gas emission reduction of soil microorganisms as claimed in claim 3, wherein the agent comprises: the preparation and the clostridium bacteria are simultaneously placed in arsenite and/or arsenate polluted soil, so that arsenic methylation and methane emission reduction are synchronously realized.
8. Use according to claim 7, characterized in that:
the clostridium bacterium is clostridium sporogenes (clostridium:)Clostridium sporogenes）LHA6。
9. A compound preparation for targeted regulation and control of synchronous arsenic conversion of soil microorganisms and emission reduction of greenhouse gases is characterized by comprising the following components in parts by weight: comprising the preparation as claimed in claim 3 and the Clostridium bacterium as claimed in claim 7 or 8.
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| JP2022142398A JP7225466B1 (en) | 2022-04-18 | 2022-09-07 | Method and use thereof for simultaneous realization of heavy/metalloid conversion and reduction of greenhouse gas emissions through targeted control of soil microorganisms |
| US17/961,276 US11772141B1 (en) | 2022-04-18 | 2022-10-06 | Method for targeted regulation of soil microbes to synchronize heavy metal/metalloid transformation and greenhouse gas emission reduction and use |
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